Glossary and Terminology Reference

HOISA

NVIDIA Halos Outside-In Safety — The complete framework for implementing outside-in safety in industrial environments. Formerly known as PSF (Proactive Safety Framework).

SEI

Safety Event Integrator — The central component that receives, correlates, and fuses safety events from multiple sources. Formerly known as PSS (Proactive Safety Supervisor).

SDM

Safety Decision Maker — The component responsible for translating fused safety events into control actions. Formerly known as PSD (Proactive Safety Decision).

SBB

Safety Black Box — The logging and audit trail component that records execution parameters for real-time access and offline analysis. Formerly known as PSB (Proactive Safety Black Box).

SUI

Safety User Interface — The user interface component for monitoring and configuration. Formerly known as PSU (Proactive Safety User Interface).

SIPP

Sensor Input Processing Pipeline — The AI-based perception data generation component that processes sensor inputs (e.g., camera streams, radar) to identify safety-relevant events.

SIL

Software-in-the-Loop — A simulation-based testing methodology that runs the full HOISA software stack against virtual sensor inputs generated by NVIDIA Isaac Sim, enabling end-to-end validation without physical hardware.

SAIM

Safety AI Monitor - The component responsible for monitoring the health of the camera sensor inputs feeding HOISA and producing trust report to SEI.

Safety Event

A structured data object (SafetyEvent) representing a detected safety-relevant condition, including type, severity, timestamp, confidence level, and fusion metadata.

FusedSafetyEvent

The output of the SEI fusion process. Contains the original event data plus a SafetyEventStatus (FUSED, PASSTHROUGH, STALE, or UNKNOWN) indicating the fusion outcome.

Event Fusion

The process of correlating and combining safety events from multiple sources — temporal, spatial, or attribute-based — to improve confidence and reduce false positives.

FSI

Functional Safety Island — A hardware-isolated compute environment on NVIDIA Tegra platforms for safety-critical operations.

SW_FAIL

Software Failure event — A special event type indicating a malfunction in the safety software stack that compromises the safety control path.

PSSCom

A high-performance, NVIDIA proprietary communication library for packet streaming between source and sink endpoints within HOISA.

ROI

Region of Interest — A user-defined spatial zone in the camera view used to monitor occupancy and trigger safety events when objects enter or exit.

Tripwire

A virtual line placed in the camera view (e.g., at doors or aisle boundaries) that triggers directional crossing events when objects pass through it.

ATL

Automated Trailer Loading — A reference application in HOISA that involves the control of forklift safety functions during trailer loading and unloading operations.

DecisionRequest

The data structure sent from SEI to SDM containing fused safety events, sensor health status, and system status for safety decision processing.

DecisionResponse

The data structure returned by SDM containing the recommended action, decision identifier, and confidence level.

L4T

Linux for Tegra — NVIDIA’s Linux distribution for Tegra-based platforms (e.g., IGX Thor). HOISA runs in L4T user space on these systems.

CCPLEX

CPU Complex — The main CPU subsystem on NVIDIA Tegra SoCs where HOISA user-space components execute.

NGC

NVIDIA GPU Cloud — The registry and CLI used to download HOISA Debian packages, Docker images, and VSS deployment resources.