~/.oh-my-zsh/themes/agnoster.zsh-theme
...
prompt_context() {
if [[ "$USER" != "$DEFAULT_USER" || -n "$SSH_CLIENT" ]]; then
emojis=("⚡️" "🔥" "💀" "👑" "😎" "🐸" "🐵" "🦄" "🌈" "🍻" "🚀" "💡" "🎉" "🔑" "🚦" "🌙")
RAND_EMOJI_N=$(( $RANDOM % ${#emojis[@]} + 1))
prompt_segment "#1f2430" default "${emojis[$RAND_EMOJI_N]}"
fi
}
...