pal_signal provides an additional uni.kn color palette  
as a data frame containing 3 colors (Ampel or traffic signal colors).
pal_signalAn object of class data.frame with 1 rows and 3 columns.
The colors are arranged as in a traffic light ("Ampel"):
top: red or "bad"
mid: yellow or "alert"
bot: green or "good"
See https://www.uni-konstanz.de/en/university/news-and-media/create-online-and-print-media/corporate-design/ for details.
pal_unikn for the unikn default color palette with all 5 colors of pal_seeblau; 
pal_unikn_pref for a uni.kn color palette with all preferred colors; 
seecol for viewing and comparing color palettes;
usecol for using color palettes.
Other color palettes: 
pal_bordeaux,
pal_grau,
pal_karpfenblau,
pal_peach,
pal_petrol,
pal_pinky,
pal_seeblau,
pal_seegruen,
pal_unikn,
pal_unikn_dark,
pal_unikn_light,
pal_unikn_pair,
pal_unikn_ppt,
pal_unikn_pref,
pal_unikn_web