What is this toy - lots of colourful plastic octagons to slot together to make shapes/structures

[MrsFogi]

Bad description I know but dd had a play with this recently and I'd love to get it for her. Basically a pile of plastic octagons (I think) in lots of different colours with slots at the corners (or along the edges perhaps) so they can slot into each other to create towers, shapes, anything the child can think up.

ooh I so know what you mean but I'll be damned if I know what it's called

(sorry, not helpful am I?!)

we use this at work, is it the sort of thing you mean? and yes i know there's a version with red, yellow and blue slightly see-thru ones too.

Is it octons?

Those are the things - thank you!