△

△

1. (geometry) A triangle.

   △ABC

   A triangle with vertices named A, B, and C in order.

2. (astrology) The symbol for trine.
3. (entomology) A symbol to indicate that an illustration represent the underside of a specimen.
4. (shogi) a move by the 'white' shogi player

   Synonym: ☖

5. See Δ for the Greek capital letter delta.
6. See ∆ for the increment symbol.
7. (computing, dated) ISO 2047 symbol for Space

Literally 三角(さんかく) (sankaku, literally “three angles”), referring to the shape of a triangle. Most likely coined by analogy with ○.

△(さんかく) • (sankaku) 

1. not so good
2. (accounting) minus, equivalent of parentheses in English

• ◎
• ○
• ×