| ACL | Access Control List A list of allow and deny rules attached to a channel that decides who may enter, speak, listen, write in chat, and so on. See Channel ACL. |
| Auto-gain | AGC - Automatic Gain Control Software amplification that pushes quiet speech up to a target loudness so you do not have to live-adjust the slider. |
| Bitrate | How much network bandwidth one audio stream uses. Higher is better quality and more upload. Configured under Audio settings. |
| Certificate | A small file your app uses to prove who you are when connecting to a server. Stays on your machine. |
| Channel | A folder-like room for users and chat history. Channels can nest. |
| Custom emote | An image uploaded by a server admin that everyone in the server can use in chat as a shortcode, like :partyparrot:. |
| Deafened | You can neither send nor hear audio. Implies muted. |
| File server | The part of a Fancy Mumble server that stores avatar uploads, custom emotes, and shared files. Runs on port 64739 by default. |
| Frame | Decorative ring around your avatar. See Profile customization. |
| Group | A named bundle of users used inside ACLs. Groups can be inherited across channels. |
| Identity | A combination of your default username and a saved certificate. You can have separate identities for separate servers or communities. |
| Mumble server | also called Murmur The program that everyone connects to. Fancy Mumble adds extra features on top. |
| Nameplate | A gradient background behind your name in user lists. |
| Onboarding | A few questions the server asks new members at join time. Their answers decide which channels they end up in and which roles they get. See Onboarding workflow. |
| Opus | The audio format Mumble uses. Open, low-latency, excellent quality. |
| Persistent chat | Chat that stays on the server (encrypted), so you see the conversation history when you reconnect. |
| PTT | Push-to-Talk Voice transmits only while a key is held. |
| Reaction | An emoji attached to a chat message. |
| Register | Tell the server “this certificate belongs to this username”, so the same name always maps to the same person. |
| Role | A server-wide named bundle of permissions plus a display style (color, badge). Easier to manage than raw ACL groups. See Roles & permissions. |
| Self-signed | A certificate generated locally instead of issued by a certificate authority. Mumble servers do not need authority-signed certificates because the trust model is “trust the first time, then remember”. |
| SFU | Selective Forwarding Unit A part of the server that takes one screen-share stream and re-broadcasts it to every viewer. Means the broadcaster only has to upload once. |
| SuperUser | The built-in admin account on every Mumble server. Cannot be registered. Bypasses all ACLs. See SuperUser & first login. |
| VAD | Voice Activity Detection Sends audio only when speech is detected. Threshold based. |
| Whisper | Send voice only to specific users or channels instead of everyone in your current channel. |
