△ is a Greek letter, which is a common symbol in mathematics, physics, astronomy, chemistry and other disciplines. The English pronunciation is "Delta" and the Chinese pronunciation is "delta". Delta is the capital letter of the Greek alphabet, and its lowercase form is delta.

First, enter "△" for the shortcut key.

After finding the menu of the operation bar at the top of the Excel operation interface, use the shortcut key "alt+4 1463" to enter (Word2007 is alt+965 1).

2. Enter "△" without using shortcut keys.

(1) Find the Insert menu in the menu bar above the operation interface.

(2) Find the symbol menu bar in the upper right corner and click it with the mouse.

(3) The symbol status bar pops up, select the subset "Greek and coptic language" and find the "△" symbol.

(4) Click Insert and enter the "△" symbol to finish.