A right-pointing arrow marking the key that deletes ahead of the cursor.
The glyph ⌦ marks the forward delete key, which removes the character after the insertion point. On keyboards without a dedicated key the same action is reached by holding a modifier with backspace.
A right-pointing arrow whose rectangular body carries a small diagonal cross, the head a solid triangle at the right end.
Both are built from arrows, and both are used in software contexts.