
der Pen
pen injector
A small, pen-like device for administering medication, especially insulin.
Diabetiker benutzen oft einen Pen, um sich Insulin zu spritzen.
Diabetics often use a pen injector to inject themselves with insulin.
pen
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pen injector
A small, pen-like device for administering medication, especially insulin.
Diabetiker benutzen oft einen Pen, um sich Insulin zu spritzen.
Diabetics often use a pen injector to inject themselves with insulin.

stylus
An input pen for a computer, tablet, or graphics tablet that you can use to write or draw.
Mit dem Pen kann ich auf dem Tablet viel präziser arbeiten als mit dem Finger.
With the stylus, I can work much more precisely on the tablet than with my finger.

pen drive
A colloquial but increasingly outdated term for a USB flash drive.
Ich habe die Fotos auf einem Pen gespeichert, den ich dir morgen gebe.
I saved the photos on a pen drive, which I'll give you tomorrow.
'Pen' is a word from English. In German, however, it normally does not refer to an ordinary writing instrument with ink, but to a special pen-shaped device for technical or medical purposes.
Für mein neues Grafiktablett brauche ich einen speziellen Pen.
I need a special stylus for my new graphics tablet.
You can tell what kind of 'Pen' it is from the context. Words like 'Insulin' (insulin) or 'spritzen' (to inject) point to a medical device, while 'Tablet' (tablet) or 'zeichnen' (to draw) refer to a stylus.
Der Arzt zeigte ihr die richtige Anwendung des neuen Pens.
The doctor showed her how to use the new pen injector correctly.
The use of 'Pen' for a USB flash drive is becoming outdated today. In modern colloquial speech, the terms 'USB-Stick' (USB flash drive) or simply 'Stick' (flash drive) are much more common.
Hast du die Dokumente auf einem Stick gespeichert?
Did you save the documents on a flash drive?
In a medical context, 'Pen' is often combined with the medication it contains. The most common compound is 'Insulin-Pen' (insulin pen).
Moderne Insulin-Pens sind sehr einfach zu bedienen.
Modern insulin pens are very easy to use.
pen / pin / apprentice
A Stift is a general term for a device used for writing or drawing, usually on paper. A Pen specifically is a digital stylus for computers or tablets. Stift is therefore appropriate for paper, while Pen is used for direct input on a screen.

Auf dem Tablet zeichnet Mia die Skizze mit einem Pen.
Mia draws the sketch on the tablet with a stylus.
Auf dem Papier zeichnet Mia die Skizze mit einem Stift.
Mia draws the sketch on paper with a pen.