  We rederive the characters of all unitary irreducible representations of the
$(d+1)$-dimensional de Sitter spacetime isometry algebra
$\mathfrak{so}(1,d+1)$, and propose a dictionary between those representations
and massive or (partially) massless fields on de Sitter spacetime. We propose a
way of taking the flat limit of representations in (anti-) de Sitter spaces in
terms of these characters, and conjecture the spectrum resulting from taking
the flat limit of mixed-symmetry fields in de Sitter spacetime. We comment on a
possible equivalent of the scalar singleton for the de Sitter (dS) spacetime.

High Energy Physics - Theory