In Britain, it means diddly. It means you're a male, presumably respectable. If you have no other title, then the overly-British will put esq. after your name on an envelope, etc. In America, I believe it's sometimes used after a lawyer's surname. However, I don't see it used much by U.S. lawyers.
Davit systems are most often used to lower an emergency lifeboat to the embarkation level to be boarded. Davits can also be used as man-overboard safety devices to retrieve personnel from the water. The lifeboat davit has falls (now made of wire, historically of manila rope) that are used to lower the lifeboat into the water.
Arm Flexion and Medial Rotation. The anterior part of the deltoid works with other shoulder and arm muscles to medially rotate and flex the arm. The arm rotates medially when you turn the front of the arm bone toward your body, and you flex your arm when you raise it up to the front of your body.