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2. Knife sharpening - Wikipedia

   en.wikipedia.org/wiki/Knife_sharpening

   Typical edge angles are about 20° (making the included angle 40° on a double-ground edge). [2] The edge angle for very sharp knives can be as little as 10 degrees (for a 20° included angle). Knives that require a tough edge (such as those that chop) may sharpen at 25° or more.

3. Sharpening - Wikipedia

   en.wikipedia.org/wiki/Sharpening

   Very sharp knives sharpen at about 10 d.p.s (degrees per side) (which implies that the knife's edge has an included angle of 20-degrees). Generally speaking, razors, paring knives, and fillet knives should be the sharpest knives at an angle of 12° – 18°.

4. Grind - Wikipedia

   en.wikipedia.org/wiki/Grind

   In practice, double bevels are common in a variety of edge angles and back bevel angles, and Western kitchen knives generally have a double bevel, with an edge angle of 14–16° (included angle of 28–32°) and a maximum of 40° as specified by International standard ISO 8442.1 (knives for the preparation of food).

5. Rake angle - Wikipedia

   en.wikipedia.org/wiki/Rake_angle

   In machining, the rake angle is a parameter used in various cutting processes, describing the angle of the cutting face relative to the workpiece. There are three types of rake angles: positive, zero or neutral, and negative. Positive rake: A tool has a positive rake when the face of the cutting tool slopes away from the cutting edge at inner side.

6. Santoku - Wikipedia

   en.wikipedia.org/wiki/Santoku

   Santoku. The santoku bōchō (Japanese: 三徳包丁, 'three virtues knife' or 'three uses knife') or bunka bōchō (文化包丁) is a general-purpose kitchen knife originating in Japan. Its blade is typically between 13 and 20 cm (5 and 8 in) long, and has a flat edge. The santoku has a sheepsfoot blade that curves down an angle approaching ...

7. Beam diameter - Wikipedia

   en.wikipedia.org/wiki/Beam_diameter

   The beam diameter or beam width of an electromagnetic beam is the diameter along any specified line that is perpendicular to the beam axis and intersects it. Since beams typically do not have sharp edges, the diameter can be defined in many different ways. Five definitions of the beam width are in common use: D4σ, 10/90 or 20/80 knife-edge, 1 ...