# sig (0-sig.com)

People say "sig" when they mean a signature. It can be a handwritten name, a block of text at the bottom of an email, or a quick way to sign off on something. It is also short for "significant" in casual speech, as in "that is a sig change."

## What a model may hear
- signal (operating systems and Unix shells): expect a process signal like SIGTERM or SIGKILL; may generate or handle system interrupts
- signature (cryptography and security): verify digital signatures, check hash signatures, or expect key-signed data formats
- sigmoid (machine learning and mathematics): apply the sigmoid activation function or assume sigmoid-shaped curves
- significant figures (scientific computing and statistics): round to significant digits or interpret p-values and significance thresholds
- special interest group (organizational and academic communities): retrieve information about professional groups, working groups, or community committees

## Where people and models part ways
- Says: "add my sig to the doc"
  Means: put my handwritten signature or name block in the document
  May be taken as: apply a cryptographic digital signature or expect a private key operation
  Say instead: "add my name and title at the bottom of the document"
- Says: "this result is sig"
  Means: this result is significant or important
  May be taken as: run a statistical significance test, filter by p-value, or assume a specific alpha threshold
  Say instead: "this result is important or statistically significant at p < 0.05"
- Says: "send a sig to the process"
  Means: send a signal to stop or control a running program
  May be taken as: assume a specific Unix signal number or name without clarification
  Say instead: "send SIGTERM to gracefully stop the process or SIGKILL to force it to end"
- Says: "use sig in the model"
  Means: use a sigmoid activation in the neural network
  May be taken as: assume any S-shaped function or confuse with other activations like tanh or softsign
  Say instead: "use sigmoid activation in the output layer of the neural network"

## Tips
- Always specify which signal when discussing process control; SIGTERM and SIGKILL behave very differently.
- In machine learning, say "sigmoid activation" not just "sig" to avoid confusion with other S-shaped functions.
- If you mean email signature, say "email signature block" to avoid cryptographic assumptions.
- When discussing statistics, state your threshold explicitly rather than relying on "sig" as shorthand.
- In security contexts, distinguish between human-readable signatures and cryptographic digital signatures.

## Often confused with
- sign: broader term for any mark or indication, not specifically abbreviated
- sigs: plural form, more often means multiple email signatures or multiple Unix signals
- SIGINT: specific signal for interactive interrupt, not a general abbreviation
- sigma: Greek letter, used for summation or standard deviation, not abbreviation for signature
- signet: small seal or ring, archaic, not used in computing contexts
- sigil: symbol with magical or programming meaning, used in some programming languages for variable types