The rest are discussed in Harry Roberts article from 2015 titled More transparent UI code with Namespaces specifically the namespaces section of the article.
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Can't remember the name of the methodology, but:
.u-
Utility
.o-
Object
.c-
Component
Might be ITCSS from CSSWizardy?
The ".u - Utility" is part of SUITCSS naming conventions.
The rest are discussed in Harry Roberts article from 2015 titled More transparent UI code with Namespaces specifically the namespaces section of the article.