If 4! = 1x2x3x4 and is called 4 factorial, what is the sum of the numbers e.g. 4(?)= (1+2+3+4) called?

I know how to easily calculate the answer. Is there an operator name for it?
Example:
6 factorial is 6! = 1×2x3×4x5×6 = 720
6 summit is 6| = 1+2+3+4+5+6 = 21
Obviously I made up the name “summit” and symbol ”|”

Is there a commonly used term and symbol for this? I can use the summation symbol but that is unwieldy.