When discussing dogs and "knots" in the context of a teen audience, there are two primary, healthy ways this terminology applies: enrichment toys grooming care
If you factor in the (replacement if the knot fails under normal use), the risk is minimal.
GridLab, as the European Training and Research Centre for Power Systems Security was founded in 2010 as a spin-off of the System Operation and Network Analysis division of the 50Hertz electricity network transmission system operator. The service portfolio includes dispatcher trainings, simulations, seminars, technical assessments as well as network and system studies and analyses. GridLab GmbH is a subsidiary of DNV GL Energy Advisory GmbH and thus part of the DNV GL Group.