sheets

v. cover with a sheet; wrap in a sheet; provide with sheets

n. large rectangular piece of cloth used as a bed covering; thin layer or covering; thin rectangular object, panel, plate; piece of paper; broad expanse of something

Sheet or Sheets refers most often to anything which covers a large area and is proportionately thin, such as a sheet of paper, a bed sheet, or an ice sheet. The term may have a variety of meanings in many different contexts.
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Sheet 1. an oblong piece of cotton, linen, etc., for a bed covering. 2. any structure resembling such a covering. [more]Sheets - Community and Resources

Noun
1. any broad thin expanse or surface; "a sheet of ice"
(hypernym) expanse
2. used for writing or printing
(synonym) piece of paper, sheet of paper
(hypernym) paper
(hyponym) slip, slip of paper
3. bed linen consisting of a large rectangular piece of cotton or linen cloth; used in pairs
(synonym) bed sheet
(hypernym) bed linen
(hyponym) fitted sheet, contour sheet
4. (mathematics) an unbounded two-dimensional shape; "we will refer to the plane of the graph as the X-Y plane"; "any line joining two points on a plane lies wholly on that plane"
(synonym) plane
(hypernym) shape, form
(hyponym) cartesian plane
(classification) mathematics, math, maths
5. newspaper with half-size pages
(synonym) tabloid, rag
(hypernym) newspaper, paper
6. a flat artifact that is thin relative to its length and width
(synonym) flat solid
(hypernym) artifact, artefact
(hyponym) blackboard, chalkboard
7. (nautical) a line (rope or chain) that regulates the angle at which a sail is set in relation to the wind
(synonym) tack, mainsheet, weather sheet, shroud
(hypernym) line
(hyponym) futtock shroud
(part-holonym) ship
(classification) seafaring, navigation, sailing
8. a large piece of fabric (as canvas) by means of which wind is used to propel a sailing vessel
(synonym) sail, canvas, canvass
(hypernym) piece of cloth, piece of material
(hyponym) balloon sail
(part-holonym) sailing vessel, sailing ship
Verb
1. come down as if in sheets; "The rain was sheeting down during the monsoon"
(hypernym) pour, pelt, stream, rain cats and dogs, rain buckets
2. cover with a sheet, as if by wrapping; "sheet the body"
(hypernym) cover
(derivation) bed sheet

the number of pieces of paper needed to cover a poster panel area.