For X element core sequence we have a term and definition in Yeast Genome.

X Element Core Sequence (Yeast Genome)

The only region shared by all chromosome ends, the X element core sequence is a small conserved element (~475 bp) that contains an ARS sequence and in most cases an Abf1p binding site. Between these is a GC-rich region nearly identical to the meiosis-specific regulatory sequence URS1. Possible functions include roles in chromosomal segregation, maintenance of chromosome stability, recombinational sequestering, or as a barrier to transcriptional silencing.

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