Segment Selector

Some articles on segment selector, segment, selector:

X86 Memory Segmentation - Protected Mode - Detailed Segmentation Unit Workflow
... A logical address consists of a 16-bit segment selector (supplying 13+1 address bits) and a 16-bit offset ... The segment selector must be located in one of the segment registers ... That selector consists of a 2-bit Requested Privilege Level (RPL), a 1-bit Table Indicator (TI), and a 13-bit index ...