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Symbol

 * 1)  A triangle.
 * 2)  The symbol for trine.
 * 3)  A symbol to indicate that an illustration represent the underside of a specimen.
 * 4)  a move by the 'white' shogi player
 * 5) See Δ for the Greek capital letter delta.
 * 6) See ∆ for the increment symbol.
 * 7)  ISO 2047 symbol for Space
 * 1) See ∆ for the increment symbol.
 * 2)  ISO 2047 symbol for Space

Etymology
Literally 'three angles' (三角), referring to the shape of a triangle. Most likely coined in analogy with ○.

Noun

 * 1) not so good
 * 2)  minus, equivalent of parentheses in English