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The heart (♥) has long been used as a symbol to refer to the spiritual, emotional, moral, and in the past also intellectual core of a human being. As the heart was once widely believed to be the seat of the human mind, the word heart continues to be used poetically to refer to the soul, and stylized depictions of hearts are extremely prevalent symbols representing love. However, more realistic depictions of human hearts tend to have macabre connotations of death and violence, quite unlike the concepts associated with the poetic and symbolic heart. This discrepancy is a common source of dark humor.

Contents 1 As metaphor 1.1 In mythology, spirituality and religion 1.2 In early science and philosophy 2 As icon 3 I ♥ 4 Additional images 5 See also 6 References

In religious texts such as the Bible [1], the heart has historically been ascribed much mystical significance, either as metaphor or as an organ genuinely believed to have spiritual or divine attributes.

In the Bible, this idea emerges in the earliest passages; Genesis 6:5 situates the thoughts of evil men in their hearts, and Exodus 5 through 12 speak repeatedly of the Lord "hardening Pharaoh's heart." By this it is meant that God made Pharaoh resolve not to let the Israelite slaves leave Egypt, in order to bring judgment against Pharaoh and demonstrate his power: "'Go to Pharaoh, for I have hardened his heart and the hearts of his officials so that I may perform these miraculous signs of mine among them'" (Exodus 10:1). In the Book of Jeremiah 17:9, it is written that the "heart is deceitful above all things, and desperately wicked," and that the Lord is the judge who "tries" the human heart.

The Sacred Heart of Jesus and the Immaculate Heart of Mary are traditional Roman Catholic devotional images.

Similarly, in Egyptian mythology, the heart was weighed in a balance against the feather of Ma'at, symbolising truth, in the judgment of the dead in the Egyptian Book of the Dead. Egyptian sources do not actually reveal whether the heart had to be lighter or heavier than the feather for the deceased to pass into paradise - all depictions show only the weighing of the heart, not the actual results, heavier or lighter. (See also Egyptian soul).

Many classical and medieval philosophers and scientists, including Aristotle, considered the heart the seat of thought, reason or emotion, often rejecting the value of the brain.

The Roman physician Galen located the seat of the passions in the liver, the seat of reason in the brain, and considered the heart to be the seat of the emotions. While Galen's identification of the heart with emotion were proposed as a part of his theory of the circulatory system, the heart has continued to be used as a symbolic source of human emotions even after the rejection of such beliefs.

The Stoics taught that the heart was the seat of the human soul.

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In European traditional art and folklore, the heart symbol is drawn in a stylized shape. This shape is typically colored red, suggesting both blood and, in many cultures, passion and strong emotion. The hearts and the diamonds are the two red suits in most playing card decks. The shape is particularly associated with romantic poetry; it is often seen on St. Valentine's Day cards, candy boxes, and similar popular culture artifacts as a symbol of romantic love.

What the traditional "heart shape" actually depicts is a matter of some controversy. It only vaguely resembles the human heart. Some people claim that it actually depicts the heart of a cow, a more readily available sight to most people in past centuries than an actual human heart. However, while bovine hearts are more similar to the iconic heart shape, the resemblance is still slight. The shape does resemble that of the three-chambered heart of the turtle, and that of the human male prostate gland, but it is very unlikely that the image was patterned after either of these organs.

The "heart" shape could also be considered to depict features of the human female body, such as the female's pubic mound or spread vulva. The tantric symbol of the "Yoni" is another example of a heart-shaped abstraction of a woman's vulva. In fact, the symmetry resembles the vulva far more than the asymmetry of the organ. In the introduction to the Vagina Monologues Gloria Steinem writes, "[The heart] was reduced from power to romance by centuries of male dominance."

Others maintain that the heart resembles the shape of the female breasts or the female buttocks.

Another possible origin can be seen on the coins of the ancient city of Cyrene, some of which depict the seeds or fruit of the now-extinct silphium plant. The seeds are distinctly heart-shaped. Since this plant was widely used as an ancient herbal contraceptive or abortifacient, this shape may have come to be associated with sexuality and love.

The "heart" shape is formed by the back and wings of a dove, which was associated with Aphrodite, the ancient Greek goddess of love.

It may also be a stylised form of the combination of the silhouettes of two people kissing.

The most common emoticon for the heart is <3. In Unicode, the heart symbol is U+2665, and it can thus be generated in HTML by typing ♥ or ♥, or by the HTML entity ♥. Mathematically, a heart-shaped figure, called a cardioid, can be represented by plotting a graph of either (x² + y² − 1)³ = x²y³ or, in polar form, r = 1 − sin(θ)

I ♥ (pronounced "I love" or spoken as "I heart" to indicate the symbol) is a slang expression used to indicate love or affection, sometimes with a connotation that the feeling is superficial or juvenile. It is a play upon Milton Glaser's classic logo, I ♥ NY (pronounced I Love New York). In the U.S., it can be used to show that one has a crush on someone or are in love with someone, being used as I ♥ someone's name or as Someone ♥ Someone else. It is also present in some recent titles, e.g. the film I ♥ Huckabees or the video game We ♥ Katamari.

The widespread use of this expression has inspired many parodies. Originally pronounced "I love", the phrase has recently been used by young hipsters who have taken to facetiously verbalizing it as "I heart". Other examples include:

• Parody bumper stickers have included "I ♠ My Cat" (spade being a homonym and common pun for spayed), , referring to spousal abuse), or "I ♣ Seals" (referring to seal clubbing).
• A The Far Side cartoon by Gary Larson pictured Godzilla driving a car with an "I 8 NY" bumper sticker (8 meaning ate).
• Playboy once reported that a novelties manufacturer was offering little square stickers picturing a screw (representing a vulgar slang term), to be placed stealthily over the heart in stickers such as "I ♥ My Pomeranian," for example .
• T-shirts parodying this phrase and Unicode have read "I ? Unicode", ? being the "replacement character" used on a Macintosh when the font in question does not contain a graphic for the Unicode character in question, or "I ☐ Unicode", as some Windows fonts show.
• The usual ASCII emoticon for the heart symbol is <3, depicting a heart rotated 90 degrees clockwise. It is sometimes playfully verbalized as "I lessthanthree...".
• An inverted heart symbol is used for a fake, satirical product called "Hiney Wine". [2]

2C-B pill.

Mating Mute Swans may appear to make a negative space heart.

A red potato exhibiting gemination, an effect brought about by a partial twinning during development.

Heart carved in tree

• Heart
• Heart (Anthropology)
• Hearts (suit in cards)
• Soul
• Sacred Heart of Jesus
• Anahata
• Heartagram
• I ♥...

• The Shape of My Heart: Where did the ubiquitous Valentine's symbol come from? by Keelin McDonell, Slate.com.

• www.heartsymbol.com: The Heart Symbol - Origin, History And Significance by Prof. Armin Dietz