Thanks to a good professional I asked, it is a "CIDR". He referred me to a good Wiki article on the meaning: http:/en.wikipedia.org/wiki/Classless_Inter-Domain_Routing It tells all about it.
"Le" means "the" in French, and "slash" refers to the forward slash (/) symbol. So "le SLASH vel" would mean "the vel forward slash" in a mixture of French and English.
If the slash is /, it means to divide in most cases
the / forward slash means or
This is a slash: / The slash stands for division. 10/2 would be read as ten divided by two.
It can be used for division. So the following formula will divide the value in A3 by the value in A10: =A3/A10
The slash can be used for division like this:=A2/B2
'a slash' is an English term to mean urinate. eg. 'I am going for a slash' = 'I am going to piss/urinate/take a leak etc...
The equal sign with the slash means "is not equal to".
A circle with a slash through it means no or none in medical documentation.
The letter 'O' with a slash through it is the number zero.
It is the / mark - it is slanted forward as you read left-to-right. A back slash is the \ mark.
to divide