Robot vacuum jargon, decoded

Robot vacuum marketing has a vocabulary problem. Every box is a wall of acronyms and invented words, and brands know that a confused shopper reaches for the biggest number or the most features. Here's a plain-English decoder for the terms you'll actually meet, so you can tell a meaningful spec from a sticker.

Navigation and mapping

Pa (pascals) — the unit of suction. More is better on carpet, but with sharply diminishing returns; past a point it's a number on a box, not a cleaner floor.

Lidar — a spinning laser that maps your home and works in total darkness. The little turret on top of premium robots.

SLAM / vSLAM — "Simultaneous Localisation and Mapping." The robot figures out where it is and builds the map at the same time. "vSLAM" does it with a camera. We unpack this fully in our explainer on how robots see.

No-go zones / virtual walls — areas you draw in the app that the robot won't enter. Genuinely useful; only possible with proper mapping.

Brushes, bins and the dock

Anti-tangle brush — a roller (often rubber or cone-shaped) designed so hair slides off instead of wrapping. A real quality-of-life feature in homes with long hair or pets.

Auto-empty dock — the base station sucks the robot's bin into a larger bag so you ignore it for weeks. The single biggest reduction in your involvement.

HEPA filter — a fine filter that traps tiny particles and allergens. Worth having if anyone in the home has allergies.

Mopping terms

2-in-1 — vacuums and mops. Read the small print: most "2-in-1" pads wipe; the good ones use rotating pads with downward pressure.

Mop lift — the robot raises its pads when it detects carpet so it doesn't soak your rugs. Essential in mixed-floor homes.

Self-washing dock — the dock rinses and dries the mop pad for you, killing the gross part and the musty smell.

Lawn and garden crossovers

Some terms jump categories. Mulching (on robot mowers) means cutting tiny clippings and dropping them back to feed the lawn. RTK-GPS is the wire-free boundary tech that lets a mower learn your garden's edges — covered in our best lawn mowers guide.

The words that mean little

• "AI-powered" with no detail — marketing until proven otherwise. What matters is where the AI runs and what it actually recognises.
• "Smart" on its own — meaningless; look for the specific feature (lidar, app control, no-go zones).
• Object-recognition counts ("avoids 100+ objects") — what matters is dodging the few that trip robots up, not the tally.

Now that the box makes sense, shop on substance. Line models up term by term in robot vacuums, see our top-rated picks, or build on this with our deeper buying guides.