\documentclass{article}
\usepackage[bbgreekl]{mathbbol}
\begin{document}
\[
 \Langle \Eins \Rangle, \qquad
\Lbrack \Eins \Rbrack, \qquad
\Lparen \Eins \Rparen,
\]
\[
\bbalpha, \bbbeta, \bbeta \bbchi, \bbdelta, \bbespilon, \bbgamma, \bbiota, \bbkappa,
\bblambda, \bbmu, \bbnu, \bbomega, \bbphi, \bbpi, \bbpsi, \bbrho, \bbsigma, \bbtau,
\bbtheta, \bbupsilon, \bbxi, \bbzeta
\]
\end{document}