▁color ▁line ▁and ▁throughout ▁his ▁Hall ▁of ▁Fame ▁career ▁with ▁the ▁Brook lyn ▁D od gers , ▁is ▁the ▁subject ▁of ▁two ▁such ▁grand father ▁cla uses . ▁ ▁In ▁ 1 9 9 7 , ▁ML B ▁prohib ited ▁all ▁teams ▁from ▁issu ing ▁# 4 2 ▁in ▁the ▁future ; ▁current ▁players ▁we aring ▁# 4 2 ▁were ▁allowed ▁to ▁continue ▁to ▁do ▁so . ▁New ▁York ▁Yan ke es ' ▁closer ▁Mar iano ▁River a ▁was ▁the ▁last ▁active ▁player ▁to ▁be ▁grand father ed ▁in , ▁we aring ▁# 4 2 ▁until ▁he ▁retired ▁after ▁the ▁ 2 0 1 3 ▁season . ▁However , ▁since ▁ 2 0 0 9 , ▁all ▁uniform ed ▁personnel ▁( play ers , ▁man agers , ▁coach es , ▁u mp ires ) ▁are ▁required ▁to ▁wear ▁# 4 2 ▁( without ▁names ) ▁on ▁Jack ie ▁Robinson ▁Day . ▁ ▁In ▁ 2 0 1 4 , ▁Robinson ' s ▁al ma ▁mater ▁of ▁U CLA , ▁where ▁he ▁played ▁four ▁sports ▁from ▁ 1 9 3 9 ▁to ▁ 1 9 4 1 , ▁retired ▁# 4 2 ▁across ▁its ▁entire ▁athlet ic ▁program . ▁( The ▁men ' s ▁basketball ▁team ▁had ▁previously ▁retired ▁the ▁number ▁for ▁W alt ▁H azz ard .) ▁Three ▁athlet es ▁who ▁were ▁we aring ▁the ▁number ▁at ▁the ▁time ▁( in ▁women ' s ▁s occer , ▁soft ball , ▁and ▁football ) ▁were ▁allowed ▁to ▁continue ▁we aring ▁the ▁number ▁for ▁the