The triangle symbol is ▲, Black up-pointing triangle, U+25B2, and the outline is △. The 60 rows point up, down, left and right in three sizes, then add corner triangles, triangles holding a sign and four red triangle emoji.
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Big, small and pointer triangles
Each direction comes in three sizes: ▲ full, ⏶ medium and ▴ small, level with lower-case letters. Left and right also have pointers, ► and ◄, which are longer and flatter. For a corner or a diagonal edge, ◢ ◣ ◤ ◥ each fill half of the character cell.
Unicode calls a filled shape black and an outline white, so △ is White up-pointing triangle.
▶ and ◀ have emoji forms, so some phones draw them as coloured buttons.
Questions and answers
What is the Alt code for a triangle?
With Num Lock on, hold Alt and type 30 on the number pad for ▲ and 31 for ▼. The pointers ► and ◄ are Alt+16 and Alt+17. The outline △ has no Alt code, so copy it from here.
What is the HTML code for a triangle?
△ gives △ and ▴ the small ▴. ▲ has no name, so write ▲ or ▲. In LaTeX, \triangle gives △, and amssymb adds \blacktriangle for ▴.
Is △ the same as the delta symbol Δ?
No. Δ is the Greek capital letter delta, U+0394, and ∆ is the increment sign, U+2206. △ is a shape, White up-pointing triangle, U+25B3. They look alike, but a search or a screen reader treats them as different characters.
All 60 triangle symbols
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▼Black down-pointing triangleU+25BC. The usual filled triangle pointing down. Alt+31.
◀Black left-pointing triangleU+25C0. Filled, pointing left: the rewind shape.
◢Black lower right triangleU+25E2. A right-angled triangle filling the lower right half of the cell.
▶Black right-pointing triangleU+25B6. The play-button shape. Many phones draw it as an emoji unless text style is asked for.
▲Black up-pointing triangleU+25B2. The usual filled triangle. Alt+30 on a number pad, from the old PC graphics set.
⊿Right triangleU+22BF. The maths sign for a right triangle.
▽White down-pointing triangleU+25BD. The outline pointing down. NamesList gives it the alias Hamilton operator.