Nerd Fonts patches developer targeted fonts with a high number of
glyphs (icons) from popular sets such as Font Awesome, Devicons,
Octicons, Material Design and the Powerline symbols.

By default this builds every patched family upstream releases, in
all three variants, into /usr/share/fonts/nerd-fonts/<Family>/.
That is a large package: about 600MB of downloads and several GB
installed. Two variables trim it at build time (all sources are
still listed in the .info, download only the ones you need):

  FAMILIES  space separated family names, default all of them
  VARIANTS  any of NerdFont, NerdFontMono, NerdFontPropo,
            default all three

    FAMILIES="Hack JetBrainsMono" VARIANTS=NerdFontMono \
      ./ttf-nerd-fonts.SlackBuild

A build with a single family is named after it, e.g.
FAMILIES=FiraCode produces ttf-nerd-fonts-firacode, so families can
be installed as separate packages side by side. Do not install a
multi-family package together with single-family ones holding the
same family, they ship the same files.

Available families (names are case sensitive):

  0xProto 3270 AdwaitaMono Agave AnnotationMono AnonymousPro
  Arimo AtkinsonHyperlegibleMono AurulentSansMono BigBlueTerminal
  BitstreamVeraSansMono CascadiaCode CascadiaMono CodeNewRoman
  ComicShannsMono CommitMono Cousine D2Coding DaddyTimeMono
  DejaVuSansMono DepartureMono DroidSansMono EnvyCodeR
  FantasqueSansMono FiraCode FiraMono GeistMono Go-Mono Gohu
  GoogleSansCode Hack Hasklig HeavyData Hermit iA-Writer
  IBMPlexMono Inconsolata InconsolataGo InconsolataLGC
  IntelOneMono Iosevka IosevkaTerm IosevkaTermSlab JetBrainsMono
  Lekton LiberationMono Lilex MartianMono Meslo Monaspace Monofur
  Monoid Mononoki MPlus Noto OpenDyslexic Overpass ProFont
  ProggyClean Recursive RobotoMono ShareTechMono SourceCodePro
  SpaceMono Terminus Tinos Ubuntu UbuntuMono UbuntuSans
  VictorMono ZedMono

Arimo, HeavyData, Tinos and Ubuntu have no NerdFontMono variant.

The symbols-only font is not included, it is available separately
as ttf-nerd-fonts-symbols.