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Where does the Chebshev Chebyshev polynomial notation come from?

The $k$th Chebshev Chebyshev polynomial is denoted by $T_k$ where

$T_k(x) = \cos(k\cos^{-1}(x))$

I was wondering where this notation came from. It has been suggested that it comes from Tchebychef Tschebyscheff (the Russian name for ChebshevChebyshev) but does anyone know the first use of this notation or verify this is the reason?
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Where does the Chebshev polynomial notation come from?

The $k$th Chebshev polynomial is denoted by $T_k$ where

$T_k(x) = \cos(k\cos^{-1}(x))$

I was wondering where this notation came from. It has been suggested that it comes from Tchebychef (the Russian name for Chebshev) but does anyone know the first use of this notation or verify this is the reason?