I noticed I have some huge crazy-named files in oracle_home/dbs

What the heck are the strange ones?
do the snap* files have something to do with statspack.snap??
some of the files with 0* are over a gig and I would like to remove them if they mean nothing. All of those are over 8 months old.

05ea5ora_1_1
06ea8hv9_1_1
07ea8i3j_1_1
08ea8i50_1_1
09ea8i5r_1_1
0aea8i6k_1_1
0bea8k9g_1_1
0cea8kjd_1_1
0dea8kkr_1_1
0eea8kla_1_1
0fea8klp_1_1
0gea8ksd_1_1
0hea8kua_1_1
0iea8l54_1_1
0jea8l67_1_1
0kea8l6n_1_1
0lea8l76_1_1
0mea8lca_1_1
0nea8ldj_1_1
0oea8lem_1_1
0peafl4m_1_1
0qeafl63_1_1
0reafl6t_1_1
0seafl7m_1_1
init.ora
initbck1.old
initbck1.ora
initdw.ora
initkod1.ora
lkBCK
lkKOD
snapcf_bck1.f
spfilebck1.ora
lkBCK