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It naturally crept into mathematical usage and notation. … But for Hilbert and others this was quite natural notation, as was lower case $\mathfrak{f}$ for the German word 'Fuhrer' (printed with Umlaut over 'u'), now usually called the "conductor". …

2) A number of people used the notation g, including Freudenthal ((nag. Math., 1954-56), then Kostant (Trans. Amer. Math. … (In 1969 I did buy a copy of Bourbaki but was already used to writing $\delta$ and using other root system notation.) ADDED: Notation is essential in mathematics but often problematic. …

Though I don't have inside information, it's clear that the notes in Asterisque 100 (1982) by BBD gave the first formal definition of t-category and t-structure on a triangulated category (section 1.3 …

My first encounter with it was in the 1979 Kazhdan-Lusztig paper on Hecke algebras, where they use a bar notation and combine this involution on Laurent polynomials with the inversion in a given Coxeter … The bar notation makes it unnecessary to invent a name for the involution on Laurent polynomials, but "bar involution" will certainly do. …

I've never seen an authoritative explanation for the choice of the lower case letter $\ell$ or $l$ to denote an arbitrary prime different from a given prime $p$. This now has its own LaTeX command \e …

My experience with subjects that have a long history suggests that notation in mathematics evolves over time in less than logical ways. … In some areas there simply isn't any "standard" notation, while in many others some influential sources have tended to establish a de facto standard. …

Here the vertices correspond to simple roots, not just simple reflections, so the notation has to incorporate some length information. …