It usually means that the author of the formula started with Lotus 123.

In lotus, you could start a formula with +
+a1+b1

Excel starts with an equal sign:
=a1+b1

But some people have muscle memory and can't stop typing that + even though they
don't need it.

sabi wrote:

Placing a + infront of a sum means what?- eg:=+SUM(C6+C8+C10)

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Dave Peterson