Glossary

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R(also: R Programming Language, R Project, R Statistical Computing)

A free, open-source programming language and software environment widely used for statistical computing, data analysis, and graphical representation. R is the standard tool for statisticians in both academia and industry, offering extensive libraries for creating data…

RAG(also: Retrieval-Augmented Generation)

An AI architecture pattern that pairs a large language model with an external knowledge store (typically a vector index of text chunks) so that, for each user query, relevant documents are retrieved first and injected into the prompt before the model generates a response. RAG…

RFID(also: Radio Frequency Identification, RFID Tag)

A technology that uses electromagnetic fields to automatically identify and track tags attached to objects. RFID tags contain electronically stored information that can be read by RFID readers without line-of-sight contact. In accessibility applications, RFID enables physical…

RSSI(also: Received Signal Strength Indicator, Received Signal Strength Index)

A measurement of the power level of a radio signal received by a device, commonly used in Bluetooth and Wi-Fi based indoor positioning systems. In accessible indoor navigation, RSSI readings from BLE beacons are used to estimate a user's distance from each beacon — stronger…

Reinforcement Learning(also: RL)

A type of machine learning where a system learns to make decisions by performing actions in an environment and receiving rewards or penalties based on the outcomes. Unlike supervised learning, which learns from labelled examples, reinforcement learning discovers optimal…

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