Names and Titles
Use last names and appropriate titles until specifically invited by your German host or colleagues to use their first names.
Titles are very important. Never use titles incorrectly and never fail to use them. If unsure, err in favor of a higher title.
A Doktor can be either a medical doctor or a holder of a Ph.D.
Two titles should not be used at the same time, except when addressing a letter to someone. If a person does hold several titles, the higher one is used in speaking to him/her.
Body Language
Germans may appear reserved and unfriendly until you get to know them better.
Never put your hands in your pockets when talking with someone.
“Thumbs up” gesture means “one” or is a sign of appreciation or agreement.
Making hands into two fists, thumbs tucked inside the other fingers and making pounding motion lightly on a surface expresses “good luck.”
Never use the “okay” sign (index finger and thumb jointed together to make a circle). This is considered a rude gesture.
Don’t point your index finger to your own head. This is an insult.