could you please explain me what pipe symbols | means in bellow's function?! $$ force = -R_B * D(v_a^B|v_a^B|)*c_D $$ where we have introduced a notation $ D(b) = diag(b_x; b_y; b_z) $for a vector $b$.
2026-03-26 07:48:26.1774511306
pipe (vertical bar) symbol in function
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