MID (Machine ID)
Google's unique entity identifier. Format: /g/xxxxx or /m/xxxxx
CID
Customer ID / Place CID. Used in Maps URLs.
Place ID
Google Places API identifier. Used for Place Details.
SI String
Search Intent - encoded business/panel data in search URLs.
IK (Image Key)
Unique photo identifier. Generated when clicking photos.
Data ID
Internal data identifier used in SerpAPI results.