Fix Kali Linux terminal display

.zshrc

# Check your environment locale:
# $ env | grep 'LANG'
# GDM_LANG=en_US.utf8
# LANG=en_US.UTF-8
# LANGUAGE=en_US.UTF-8

# Adjust ~/.zshrc
# [snippet]
if [[ "$color_prompt" = yes ]]; then
    PROMPT=$'%F{%(#.blue.green)}┌──${debian_chroot:+($debian_chroot)──}(%B%F{%(#.red.blue)}%n%(#.💀.💣)%m%b%F{%(#.blue.green)})-[%B%F{reset}%(6~.%-1~/…/%4~.%5~)%b%F{%(#.blue.green)}]\n└─%B%(#.%F{red}#.%F{blue}$)%b%F{reset} '
    RPROMPT=$'%(?.. %? %F{red}%B⨯%b%F{reset})%(1j. %j %F{yellow}%B⚙%b%F{reset}.)'
    
    # enable syntax-highlighting

# [snippet]

Reference: https://www.linuxquestions.org/questions/linux-newbie-8/terminal-doesn%27t-display-unicode-kali-2020-4-zsh-4175685834/page2.html