The macro is identical to \ldots in texted, but this way, tex2lyx can import both \ldots (as InsetSpecialChar) and \dots (as unicode glyph), while retaining the original distinction (which might get relevant with some special packages or via user redefinition of one of these macros).
0x2023 "\\textifsymbol[ifgeo]{116}" "ifsym" "" # TRIANGULAR BULLET # ≈ 0x25b8
0x2024 "." "" "notermination=text" "" "" # ONE DOT LEADER # ≈ FULL STOP
0x2025 ".\\,." "" "notermination=text" "" "" # TWO DOT LEADER
-0x2026 "\\ldots" "" "" "\\ldots" "" # HORIZONTAL ELLIPSIS
+0x2026 "\\dots" "" "" "\\ldots" "" # HORIZONTAL ELLIPSIS
#0x2027 "" "" "notermination=text" "" "" # HYPHENATION POINT (visible symbol used to indicate correct positions for word breaking, looks like but is not 0x00b7 middle dot)
#0x2028 "" "" "" "" "" # LINE SEPARATOR
#0x2029 "" "" "" "" "" # PARAGRAPH SEPARATOR