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2. Sign convention - Wikipedia

   en.wikipedia.org/wiki/Sign_convention

   In physics, a sign convention is a choice of the physical significance of signs (plus or minus) for a set of quantities, in a case where the choice of sign is arbitrary. . "Arbitrary" here means that the same physical system can be correctly described using different choices for the signs, as long as one set of definitions is used consiste

3. Cash flow sign convention - Wikipedia

   en.wikipedia.org/wiki/Cash_flow_sign_convention

   The cash flow sign convention is that money you pay out has a minus sign, while money you take in has a plus sign (or no sign). [1] Most financial calculators (and spreadsheets) follow the Cash Flow Sign Convention. This is simply a way of keeping the direction of the cash flow straight.

4. List of proofreader's marks - Wikipedia

   en.wikipedia.org/wiki/List_of_proofreader's_marks

   Depending on local conventions, underscores (underlines) may be used on manuscripts (and historically on typescripts) to indicate the special typefaces to be used: [2] [3] single dashed underline for stet, 'let it stand', proof-reading mark cancelled. single straight underline for italic type; single wavy underline for bold type

5. Passive sign convention - Wikipedia

   en.wikipedia.org/wiki/Passive_sign_convention

   Illustration of the "reference directions" of the current (), voltage (), and power () variables used in the passive sign convention.If positive current is defined as flowing into the device terminal which is defined to be positive voltage, then positive power (big arrow) given by the equation = represents electric power flowing into the device, and negative power represents power flowing out.

6. Fresnel equations - Wikipedia

   en.wikipedia.org/wiki/Fresnel_equations

   The coefficients r and t are generally different between the s and p polarizations, and even at normal incidence (where the designations s and p do not even apply!) the sign of r is reversed depending on whether the wave is considered to be s or p polarized, an artifact of the adopted sign convention (see graph for an air-glass interface at 0 ...

7. Metric signature - Wikipedia

   en.wikipedia.org/wiki/Metric_signature

   In mathematics, the signature (v, p, r) [clarification needed] of a metric tensor g (or equivalently, a real quadratic form thought of as a real symmetric bilinear form on a finite-dimensional vector space) is the number (counted with multiplicity) of positive, negative and zero eigenvalues of the real symmetric matrix g ab of the metric tensor with respect to a basis.