In calligraphy, what is typically found at the upper and lower ends of letters?

The correct choice is serifs, which are small decorative flourishes or extensions at the end of the strokes of a letter. Serifs enhance the character of the typeface and improve readability by guiding the eye along the text. In traditional calligraphy, they contribute to the overall aesthetic of the lettering, adding elegance and sophistication.

In some typefaces, serifs can vary in shape and size, with some having very pronounced serifs while others may feature more subtle versions or even none at all. This distinction allows calligraphers to create a specific mood or style in their work.

The other options do not fit this description. Underscores are lines placed beneath a letter or word, primarily for emphasis or decoration, rather than being an inherent part of the letter's structure. Strokes refer to the main lines that make up the form of the letter but do not specifically pertain to what is found at the ends. Dots may appear as part of certain letters but do not serve the same functional purpose as serifs in enhancing the character of the letters themselves.