Perhaps it's some sort of Web Ontology Language (OWL) [0]. Or a reference to Winnie the Pooh, as in "Owl took Christopher Robin's notice from Rabbit and looked at it nervously. He could spell his own name WOL, and he could spell Tuesday so that you knew it wasn't Wednesday" [1]

[0] https://en.wikipedia.org/wiki/Web_Ontology_Language#Acronym

[1] https://en.wikiquote.org/wiki/A._A._Milne