AP	Access Point
CDF	Cumulative Distribution Function
FS	Feature Space
FSPL	Free Space Path Loss
GNSS	Global Navigation Satellite System
IPS	Indoor Positioning System
kNN	k Nearest Neighbors
LBS	Location Based Services
MEE	Maximum Expected Error
IPIN	Indoor Positioning and Indoor Navigation
RFID	Radio-Frequency Identification
RSSI	Received Signal Strength Indicator
RTLS	Real Time Location System