This is the 464th most frequent Icelandic word.
þ
The Icelandic letter "þ" (thorn) represents the voiceless dental fricative sound, as in the English "th" in "thing."
"Þetta" is used here as a subject meaning "This" or "These", showcasing "þ" as an essential letter in Icelandic alphabet.
Þetta eru mínir vinir.
These are my friends.
"Þegar" translates to "When" and illustrates the usage of "þ" in temporal subordinating conjunctions.
Þegar hún kemur, förum við.
When she arrives, we will go.
"þakka" means "thank" and "þér" is a polite form of "you", emphasizing "þ" usage in verbs and pronouns.