Banks, bus, parking

Bank:
Kr. - short for kronur. Icelandic crowns/Iceland's currency.
Íslandsbanki. (Íslands - Iceland. Banki - bank.) Bank of Iceland
Gjaldkerar - teller, cashier
Greiðsla - payment
Gjald - payment, fee, charge
Eftir - after
Kl. - short for klukkan. Time/clock
Virka - work
Kvittun - receipt
Viðskipti - business, business transactions.
Afgreiðsla - service/service counter
Kaup - trade, business, buy
Ótilgreindir - unspecified, unnamed
Útlendur, erlendur - foreign
Upphæð - sum, amount
Gengi - exchange rate
Íslensk - Icelandic
Þóknun - fee
Kostnæður - cost, expenses
Peningar - money
Til baka - back
Eintak - copy
Viðskiptavinar - customer
Rafrænn - electronic

Bus:
Far - passage
Farmiði - ticket
Strætó - bus
Gildur - valid
Gildir til - Valid until

Parking
Útrunnin - expires
Tími útrunninn Kl - Time runs out at
Dagsetning - date
Númer - number
Mælir - meter, measuring device
Númer miðamælis - Meter number
Bíla - car
Stöð - station
Miði - ticket
Framrúða - windshield, windscreen
Læsilegur - visible, readable
Svæði - area, zone

Miðinn setjist innan framrúðu svo læsilegt sé utanfrá gildir á gjaldsvædi.
Set the ticket inside the windshield so it's readable from the outside (to know if the time on it has run out or not).

The words were from receipts from the bank, a slip from the parking meter, and a bus transfer.