#retroreflector
Live, measured metrics for the hashtag #retroreflector from the open social web. Every number carries a named source and the time it was fetched. Nothing is estimated.
Own #retroreflector
This #name is available to claim. It becomes your portal on the open agent web: this very page, a keyword you rank for by an open public stake, and a verifiable identity for AI agents. Nobody else sells a page like this for every #name.
Day-by-day usage
measured · fosstodon.org (Mastodon public tags API) · fetched 2026-10-19 21:12 UTC0 uses by 0 unique accounts across the window. Real per-day counts, not estimates. Newest bar is today so far.
Related hashtags
measured · fosstodon.org (Mastodon public search API) · fetched 2026-10-19 21:12 UTCLive pulse
measured · fosstodon.org (Mastodon tag timeline) · fetched 2026-10-19 21:12 UTCEverything below is measured over the latest 11 public posts (spanning ~56081 hours).
Posting hours (UTC)
Languages: English (10) · French (1)
Avg boosts / post: 0
Top of the latest posts
Laser Ranging Makes GPS Satellites More Accurate https://hackaday.com/2026/03/29/laser-ranging-makes-gps-satellites-more-accurate/ #Science #Space #Geodesy #Gnss #Gps #Retroreflector
Laser Ranging Makes GPS Satellites More Accurate https://web.brid.gy/r/https://hackaday.com/2026/03/29/laser-ranging-makes-gps-satellites-more-accurate/
The Engineering That Makes A Road Cat’s Eye Self-Cleaning https://hackaday.com/2025/12/08/the-engineering-that-makes-a-road-cats-eye-self-cleaning/ #TransportationHacks #retroreflector #roadsafety #catseye
What “retroreflector” means
WikipediaA retroreflector is a device or surface that reflects light or other radiation back to its source with minimum scattering. This works at a wide range of angle of incidence, unlike a planar mirror, which does this only if the mirror is exactly perpendicular to the wave front, having a zero angle of incidence. Being directed, the retroflector's reflection is brighter than that of a diffuse reflector. Corner reflectors and cat's eye reflectors are the most used kinds.
“Retroreflector” on Wikipedia (CC BY-SA) →#retroreflector across platforms
every network with a public tag surfaceFollow #retroreflector straight to each platform’s own tag page. Where a platform publishes open data we measure it above; the rest lock their numbers behind paid APIs, so we link rather than guess.
Every number above is measured from a named public API at the shown fetch time. Nothing is estimated or extrapolated. Platforms that lock their data behind paid APIs are not shown. Agents: the same numbers, as JSON, at /api/hashtags/retroreflector